ble1
5 Iridium

Re: NMDA + Oracle RAC + DD boost

There is nothing special you need to allocate for ddboost as it should be used by default.  I'm not sure if you use vip listener for backup (which can hop around nodes depending if one is down or not) or not.  Regardless which one is it, you can specify one or multiple nodes when allocating channel, but use same NSR_CLIENT (preferably RAC vip node which you would use on server side as well).  We normally use vip address and depending on size of DB we will use one RAC node or two for backup (our RAC goes up to 10 nodes). Of course, I assume you RAC environment is balanced as ours